Colored facsimile system



Aug. 4, 1931. R. H. RANGER ET AL 1,817,098

COLORED FACSIMILE sYsTEM Filed March l. 1929 .W/YE SHAFT ARS mgl/gianlvwwozs mman HowLANvRANaeR SAMUEL sMlTH Patented Aug. 4, 1931 UNITEDSTATES PATENT OFFICE` RICHARD HOWLAND RANGER, OF NEWARK, NEW JERSEY, ANDSAMUEL B. SMITH, 0F

BROOKLYN, NEW YORK, ASSIGNORS T0 RADIO CORPORATION 0F AMERICA, A COR-PORATION 0F DELAWARE COLORED FACSIMILE SYSTEM Application led March 1,

The present invention relates to the transmission of facsiiniles and thelike over wire, wired radio or radio communication lines and isparticularly concerned with the transmission of these pictures so thatthey may be received in their natural colors without the need ofresorting to manual coloring processes or receiving the same pictureseveral times in order to color the same in a manucr closelyapproximating an original.

By the terni pictures we, of course, wish to include all printedmattei', such as, documents, checks, financial statements, newspapersheets, fashion plates and the like and also all views in colors,colored etchiiigs and the like and the term picture as used throughoutthe following specification should be considered in a generic and not ina limiting sense. p

It has been known in the art to which .the present invention relatesthat it is possible to reproduce transmitted pictures in colors at thereceiver by successively transmitting the picture several differenttimes while using a different color screen at thetransnitter for eachtransmission, so as to mark a recording paper according to theparticular color tone intensity on the original picture, but suchsystems are not without o blection in that the difficulties ofsynchronizing and exactly matching the various spots of the receivedpicture with those of the transinitted picture are inherent and cannotbe conveniently avoided.

According to the present invention we have provided a novel method andmeans whereby it is possible to produce at. the receiver picturesdirectly from incoming signal pulses in colors closely blending with andapproximating the colors on the original transmitted picture, in amanner to be hereinafter described. l

Therefore, an object of our invention 1s to provide a novel method andapparatus for receiving by a single operation, pictures ytransmittedfrom a distant point by a single transmission operation, in colorsclosely approximatingI the original transmitted picture. l t

Another object of our invention is to pro- 1929. Serial N0. 843,768.

vide a colored picture at the receiver which is composed of all thevarious shades and tones of colors in the visual spectrum while usingonly a single channel of communication for all colors, although, whereit is desired, we may use a multiplex system and a plurality ofcommunication channels.

Still another object of our vinvention is to provide in connection witha picture receiving system a novel means for applying various colorfluids or inksl to a recording surface for producing the receivedpicture.

Still another 'object of our invention is to provide a novel method andVapparatus whereby the various colors applied to the picture recordingsurface may be applied at spaced time intervals, if desired, or, atadjacent time intervals, if desired.

Still another object of our invention is to provide a method andapparatus for receiving pictures at a receiving point in such a mannerthat adjacent lines of the recording surface are colored with only asingle color marking fluid but are so arranged that the sequence ofcoloring, by use of the various color recording fluids or inks, is suchas to produce a color blended received picture that closely correspondsto the colors on the original picture beingftransmitted.

Still another object of our invention is to provide a system andarrangement for continually changing the transmission and reception ofthe picture from one to another of the various primary colors used toproduce blended colors covering the entire visible spectrum.

Still other objects of our invention are to provide a method andapparatus for tra-nsmitting and reproducing a picture in its naturalcolors which is simple in its construction and arrangement, a systemwhich is compact, convenient to install, elicient in its operation,substantially fool-proof, and capable of producing the desired resultswith the minimum of in-stallation expense.

Still other and ancillary objects of our invention will at once suggestthemselves to Athose skilled in the art to which the invention relatesby a consideration of the following specification and claims, when readin connection with the accompanying drawings forming a part of ourdisclosure, wherein:

Fig. 1 illustrates a preferred form of transmitting apparatus;

Fig. 2 a suitable form of receiving arrange-l ment for cooperating withthe transmitter of Fig. 1,'

Fig. 3 is a view of the line 3 3 of Fig. 1 looking in the direction ofthe arrows and illustrates a suitable means for driving a plurality ofcolor screens or filters;

Fig. 4 illustrates conventionally one form of recording apparatussuitable for use in connection with our invention;

Fig. 5 illustrates conventionally, on an enlarged scale, the sequence ofrecording the various colors in a three color time separated recordingaction, and the manner of building up the received picture;

Fig. G represents a color disk formed from three primary colors whichmay be substituted for the three disks shown by Fig. 3;

Fig. 7 represents a system using two primary colors, and is amoi'lification of the arrangement shown by Figs. 1 and 3; and,

Fig. 8 illustrates a further modification ef the arrangement shown byFig. 7 wherein a single disk provided with two primary colors is used.

Now making reference to the accompanying drawings, a picture carryingdrum 1 supports a picture 3 which is to be transmitted. The drum 1 maybe rotated in any preferred manner (not shown) and by means of thethreaded shaft 5, associated with the drive means for turning the drum,is advanced longitudinally in a spiral or helical path before a scanningmeans for analyzing the varying tone intensities of the elemental areasof the picture 3.

In accordance with the embodiment of the invention herein illusti'atedwe have shown as an illumination means for analyzing purposes aplurality of individual light sources 7 of the annular type surroundingtubular members 9 which contain scanning lens systems, (not herein shownbut described and claimed in copending application of Richard HowlandRanger. Serial No. 321.821, filed November 26, 1928)` and the light fromthis source 7 is projected as a point source upon the picturt` surface 3at a point which corresponds to the focus point of the lenses containedwithin the light tube members 9. The light tube members 9 are hereinshown as separated by a predetermined amount which is equal in each caseto the width of three successive lines of scanning on the transmittedpicture. However, for a two color transmission system only two scanninglenses would be provided if spaced recording is desired. Also forsuccessive line recording in either case only a single scanning lenssystem is needed, as will hereinafter be described.

Light from the picture surface is reflected through the lens systemscontained within the tubular members 9 and is then projectedbackwardly'through the tubular members 9 to a lens member 11 from whichit is projected through an adjustable diaphragm 13 to photoelectricmembers 15. The diaphragms 13 are adjustable with respect to the amountof opening in two directions by means of the thumb screws 17 in a mannerdisclosed inthe above named copending a plication of Richard HowlandRanger. uri-ents produced in the photo cells 15 by light reaching thesame are then appropriately amplified in any desired manner by means ofan amplifying system 19 and transmitted from a transmitter 21 andassociated antenna system.4 23 if the invention is to be used for radiocommunication and if for a wire system a wire line would be substitutedfor the transmitting antenna.

It will be noted that the photoelectric cell members 15 are connected inparallel and enclosed within a light opaque housing 25 so as to preventexternal light other than that rcflected from the picture surface fromeffecting any of the photoelectric elements.

The light sources 7 are preferably continually illuminated to avoidswitching arrangement and, therefore, the reflected light from thepicture surface is continually directed backwardly through the tubularmembers 9 to the lenses 11 so as to effect the photo cells. However, inorder to distinguish as to the varying colors on the transmitted picturewe have provided a plurality of color screens A, B, and C which aremounted on spindles through the sides of the housing 25 so as to rotatein the space between the ends of the light tube members 9 and the lenses11. These color screens are all driven from a single shaft 27 which isin turn rotated through a gear reduction mechanism 29 from the sameprime mover that turns the picture drum 1 and in the case where threecolor screens are provided as in the present invention the shaft 27 willturn at 1/3 of the speed of shaft 5.

As shown more particularly by Fig. 3 of the drawings gt, the colorscreens A, B, and C are each composed of 2st()o of black and 120 of red,blue, and yellow, respectively. The color screens A, B, and C composedrespectively of red, blue, and yellow (which form the primary colors fora three color system) in a 1/3 ratio with respect to the black are sopositioned on the shaft 27 that at periods when light from one of thetubes 9 is projected backwardly and is able to pass through the redportion of the disk A, for example, the light which is rejectedbackwardly through the other tubu ar members 9 will be shut off from thephoto cells associated with each of these tubes by means of the blackportion on the disks B and C. At such a period of time when the disk Bis turned so that its blue portion comes before the tube 9, the otherdisks is thus seen that the photo cells 15 are suc cessively energizedby either light passing through the red, blue or yellow portlons of thedisksl A, B, and C.

It will, of course, be recognized that in case adjacent lines of thepicture surface are to be recorded that only one light tubular member 9and one illumination source7 will be re,y

quired 'for the purpose ofprojecting light from the picture surface tothe photo cell, since there might then be only a single panchromaticphoto cell 15 and a color screen revolving between the end of thetubular member 9 at photo cell. In this case the color screen would bedriven at the same speed as shown in connection with F 1 except thatinstead of each screen being composed of 1A, red, blue, or yellow, and2/3 black, the single screen would be 1/3 red, 1A; blue, and 1A, yellowwith no black portions as shown by Fig. 6.

For convenience in recording and, also, in order to avoid substantiallyvthe detrimental eects of the fading out of signals in transmission, ithas been found desirable to space the lines of recording and thus avoidcomplete obliteration of portions of the received picture, since thefading would vary from time to time and the detrimental effects thereofdue to the time separation of recording successive picture lines will beavoided t'o a large extent.

As has been above described for consecutive transmission of adjacentlines in connection with the receiver, description will show that withvery little changes the embodiment of the receiving apparatus may bemade so as to record successive lines, although by Fig. 2 we haveillustrated a system for recording spaced lines and by Fig. 5 have showna record wherein the lines of recording have been spaced in accordancewith a system following transmitting and receiving systems disclosed byFigs. 1 and 2.

Now referring more particularly to the re-l ceiving apparatus shown byFig. 2, a receiving drum 41 is arranged for rotation on a threaded shaft43 in a mannersimilar to -that of the transmitter shown by Fig 1 andsynchronism between the rotation of the drums 1 and 41 may be maintainedin a manner described in connection with copending application of R. H.Ranger, Serial No. 51,191, filed August 19, 1925, wherein a tuning forkis used at both the transmitter and receiver for obtaining a relativelyfine aljustment of rotational speeds and this is vchecked by means of aseconds pendulum forming a secondary synchronizing means and checkingthe accuracy of the tuning fork. However, the particular synchronizingarrangement per se forms no part of the present invention and other wellknown synchronizing schemes may be substituted where de- ,sired.

Carried upon the drum 41 is a sheet 45 for recording the receivedpictures. In accordance with the preferred embodiment of the invention,since we propose to use for the recording action fiuids or inksprojected against the recording paper, we prefer to use what is known asa quick drying paper, although it should be of tough construction andnot readily torn.

Signals as transmitted from the transmitter and antenna 21 and 23,respectively, are picked up upon the receiving antenna system 47 andfrom there directed to a receiving arrangement 49 of any appropriate andwell known typehaving its output connected with an amplifying system 51.The output of the amplifier is arranged so that one output connection 53thereof is directed to one terminal of each of the signal recorders,generally designated A', B', and C, and the other connection 55 thereofis connected through an app-ropriate brush 57 to a slip ring 59 on theshaft 61 of a commutator, generally designated 63, for a purpose to behereinafter described.

The commutator 63 is driven from the shaft 43 of the picture recordingapparatus through an appropriate reducing gear system 65 of the samegeneral type as disclosed by 29 at the transmitter so as to produce onecomplete revolution of the commutator for each three revolutions of thetransmitter drum. The commutator is composed of three sections 67, 69,and 71, each of which is formed of 1% insulating material and 1/3conducting material, in much thesame manner as the color disks shown byFig. 3 are composed of 2/3 black, and l@ color portion, so that with thebrush members 7 3, 75, and 77 contacting therewith current from theamplifier 51 will successively flow through each of these contacts andinfluence the respective recorders A, B, and C', wherein recorder C isconnected through a connection 79 with the brush 73,v the recorder' B isconnected by a connection 81 with the brush 75, and the recorder A isconnected through a connection 83 with the brush 77. As hereinillustrated output cur rent from the amplifier 51 will flow through theconductor 53 to the recorder A, through the connection 83, the brush 77,the commutating segment 71, the shaft-61, slip ring 59, brush 57, andconnection 55, so that the recorder A is energized, if energy is beingtransmitted from the photo cell arranged behind the disk A at thetransmitter. rlhe direction of rotation of the commutator 63 isindicated by the arrow and it will thus be seen that after the recorderA has been energized by energy output from the amplifier 51 that therecorder B will next be energized, and then the recorder C will followin sequence, after which the recorder A will again be energized and thesequence will be repeated.

The recorders A', B', and C' may be of the general character shown byFig. 4 of the accompanying drawings and which embody the basic principleof the invention as d1sclosed in copending application of C. W. Hansellin Serial No. 333,617, filed anuary 19, 1929. Although by the presentlnventlon a somewhat modified form of recorder has been disclosed, inkor other marking fluld 1s supplied to the recorders A', B', and C' fromtanks (not shown) under relatively high pressure through any appropnatesupply means such as the tube 85 from which it is projected within therecorder between a pair of plate members 87 and 89. The plates 87 and 89are connected, as above described, by the connections 53 and 83,(considering recorder A', for example) with amplifier 51 and commutatorsection 71. The fluid or ink is then projected between these plates 87and 89 as avery fine stream and flows at high velocity through thenozzle portion of the recorder 91 and against the recording paper 45.

Upon application of signal potentials to the plates 87 and 89 the inkstream projected from the tube 25 along a line 93 through a nozzle 91 isdeflected along a path indicated as 95 so as to strike a recessedportion 97 in the nozzle from which it may flow back to the ink supplyby way of a trough 99 provided in each nozzle. The supply of ink foreach nozzle (not shown) is continually under pressure and, since thecolored inks should he projected upon the recording surface only atperiods when signals are being received, hy an appropriate arrangementof electromagnetic valves controlled from commutator G3 or as shown) b vplacing cams ilpon a shaft 109 driven through appro .iate drive gearmechanism from the re ucing gears 65, we have provided a means wherebyeach supply of ink may be turned off by the cams closing a valve in theink supply line during periods when the particular recorder is not inuse. These cams are all of similar design and arranged so as tosequentially open supply of ink or other appropriate marking fluid tothe recorders A', B', and C', in a manner and time spaced relationshipsimilar to the periods when the commutator 63 connects each successiverecorders A', B' and C' with the amplifying arrangement 51. It will thusbe seen that the ink or other fluid will not he supplied to any recorderunless the particular recorder is to be used for the purpose ofrecording the picture.

As has been above illustrated in connection with the transmitter thesuccessive disks or color screen or filters A, B, and C, whichcorrespond to the recorders A', B', and C', we have provided eachindividual recorder so that the recorder A' is supplied with red r ink,the recorder B' with blue ink, and the and close valves regulating the'deflect the ink stream no marks will be pro- A duced upon the paper..Since there is practically no inertia in the recorder it is possible towork the transmission system at extremely high rates of speed andthereby increase the efliciency of transmission of pictures and thelike, and by recording'on a 90 line screen, for example, it will be seenthat there are 30 lines per inch of the picture in red, blue, and yellowso that a good definition of the various shades is obtainable.

As has been above expressed, in order to avoid the detrimental effectsof fading and the like in signals, Fig. 5 shows conventionally and uponan enlarged scale the sequence of producing the various marks upon therecord sheet 45.

It Will be noted that the first line has been designated as 1 R, thesecond as 3 B, and, for example, the 6th line as 9 Y, meaning that whilethe line 9 Y is the 6th line from left to right on the picture it is,nevertheless, the 9th recorded in the recording process since alternatered, blue, and yellow lines are recorded.

It is also possible to utilize in a scheme of the character hereindisclosed a two color recording action and obtain satisfactory colordefinition thereby. Such a system might include, for example, the use ofcolor screens and inks, or other appropriate recording fluids, having areddish orange tint and the other having a blueish green tint incontrast to the disclosed system using the primary colors, red, blue,and yellow. In connection with this type of scheme the color disks atthe transmitter should then be composed of one-half black and one-halfeither reddish orange or bluish green and two recorders projectingsimilarly colored recording fluids against the recording surface shouldwork in conjunction therewith at the receiver. This has been shownschematically in Fig. 7, and in this connection it should be borne inmind that when this system is used in connection with a type oftransmitter shown by Fig. l, there will be provided only two lightsources 7 and two light tubes 9 operating in conjunction with only twophoto cells 15, and, similarly, at the receiver there will be only tworecorders operating in conjunction with a commutator having only a pairof segments. This has not been illustrated due to the fact that themodification seems obvious and naturally follows from what has beenshown by Figs. 1 and 2. If spaced transmission and reception is notdesired the color disks at the transmitter might be composed of one-halfof' each of the chosen primary colors, as shown by Fig. 8,

i luencing the in the same manner as was sug ested for a disk composedof one-third re blue, and yellow.

In case of the two color system, therefore, if a 90 line screen wereused there would be lines per linear inch of the received picturerecorded in each color and this would produce substantially the samegeneral effect as 30 lines' per linear inch of each of the colors red,blue and yellow.

By the above disclosure we have shown an arrangement by Which anadditive type of colored picture has been produced, but 1t is obviousthat by a superposition of the various colors one upon the other asubstractive type of colored picture may be produced by the sameapparatus for example by rotating the pick-ups and reproducers of Figs.1 and 2 vrespectively through an angle of 90, or by causing them, in thesame respective figures, to converge to the same operative point.

Further, it is also to be understood that the disclosure of our presentinvention'is applicable to multiplex communication by which all of thevarious colors may be simultaneously recorded when a multiplex system ofthe type disclosed by copending application of R. H. Ranger, Serial No.269,099, filed April 11, 1928 is utilized, or by using a system forimpressing the various signals produced in accordance With the lightinvarious photo cells as separate tone frequencies upon the transmitterand filtering the separate tones at the receiver, as has been disclosedby copending application of R. H. Ranger, Serial No. 309,273, filedSeptember 29, 1928, and copending application of R. H. Rangerl and JamesN. Whitaker, Serial No. 309,137, filed September 29, 1928.

Other modifications and changes other than those herein suggested asconcrete illustrations will at once suggest themselves to those skilledin the art and, therefore, we

desire to be limited in what modifications and' changes may be made onlyin so far as the scope of the hereinafter appended claims necessitates.

What We claim and desire to claim by Letters Patent is the following:

1. The method of recording pictures in colors closely approximatingthose of an original which includes receiving signals of varyingstrength corresponding t0 the several component color tone intensitiesonl elemental areas of a picture surface being transmitted, projecting arecording medium against a record surface for producing the receivedpicture, controlling the path of the said recording medium in accordancewith the strength of the received signals, and successively changing therecording from one to another of a series of recording mediumscorresponding in color to the several component colors chosen.

ling the path of the recording mediums projected against said recordingsurface, and successively and alternately changin the recording actionfrom one to another o said recording mediums for rebuilding the receivedpicture in a line for line manner `in varying colors corresponding tothe primary colors from which an original picture was formed.

3. The method of reproducing transmitted pictures in colors closelyapproximating the colors in an originally transmitted picture vvhichincludes receiving signals corresponding in strength to the severalcomponent color tone intensities or elemental areas of a transmittedpicture, projecting a series of colored recording fluids against arecord surface for rebuilding the picture, controlling the path of therecording mediums projected against said recording surface, andsuccessively changing the recording action from one to another 0f saidrecording mediums for yrebuilding the received picture in a line forline manner in varying colors corresponding to the component' colorsfrom which an original picture Was formed.

4. The method of recording pictures in colors closely approximatingthose of `an original which includes receiving signals varied instrength in accordance with successive color intensities ofseveralcomponent colors forming the elemental areasl of a picturesurface being transmitted, projecting a recording medium against arecord surface for forming a received picture, controlling the path ofthe said recording medium in accordance with the strength of thereceived signals, and changing the recording in a predetermined sequencefrom one to another 'of a series/of component' colored recordingmediums.

5. In an ap aratus for recording pictures in colors close yapproximating those of an original picture, means for receiving signalscorresponding to the predetermined component colors comprising anoriginal picture, a recording surface for recording the said receivedpicture, means for projecting colored recording fluids against saidsurface, and means for sequentially changing the recording action fromone to another of said colored recording mediums.

6. In an apparatus for recording pictures in colors, means for receivingsignals varying in strength in proportion to the several component colortone intensities on elemental areas of a' transmitted picture surface, areico 'ist

- originally transmitted picture,

cording drum carrying a surface for recording the received pictures,means for projecting a plurality of different colored recording mediumsagainst said record surface for producing a received picture, means forcontrolling the path of said recording mediums in accordance with thestrength of said received signal pulses, and means for successivelychanging the recording 'action from one to another of said coloredrecording mcdiums for successively building up a received,I picture in aline for line manner inwhicll each successive line is produced in adifferent color.

7. In an apparatus for reproducing transmitted pictures in colorsclosely approximating those of an original picture, means for receivingsignals varied in accordance with the elemental tones of an originallytransmitted picture, a recording drum carrying a record surface uponwhich the received picture is to be produced, means for projecting aplurality of different colored recording fluids against said drum andrecord surface, means controlled by said received signals forcontrolling each of said recording fluids, and means for changing therecording action in sequence from one to another of said recordingfluids for producing a picture having the successive lines thereorecorded in different colors.

8. In an apparatus for reproducing transmitted pictures in colorsclosely approximating those of an original picture, means for receivingsignals varied in accordance with predetermined color tones on elementalareas of an originally transmitted picture, a recording drum carrying arecord surface upon which the received picture is to be produced, meansfor projecting a plurality of different colored recording fluids againstsaid drum and record surface, means controlled by said received signalsfor controlling each of said recording fluids, and means for changingthe recording action sequentially and at predetermined time intervalsfrom one to another of said recording fluids for producing a builtuppicture.

9. In an apparatus for recording pictures in colors closelyapproximately those of an means for receiving signals corresponding tothe several component tone intensities of elemental areas of thetransmitted picture, a recording drum carrying a surface upon which thereceived signal is to be produced, means for projecting sequentiallyrecording fluids of differing colors against said drum and meanscontrolled by received signal pulses for controly ling each of saidprojected recording fluids to produce said picture.

In an apparatus for recording pictures in colors closely approximatelythose of an originally transmitted picture, means for receiving signalsvaried in accordance with the elemental tones on the transmittedpicture, a

which the received signal is to be recorded, a

plurality of electrostatic recording means ad- ]acent said picture drum,means for projecting recording fluids of different colors through eachof said recorders and against said drum, and means controlled byreceived signal pulses for varying the potentials applied to each ofsaid electrostatic recorders for controlling the amount of recordingfluid reaching said drum.

1l. In an apparatus for recording pictures in colors closelyapproximating those of an originally transmitted picture, which in`cludes, means for receiving signals, a recording drum carrying a surfaceupon which the received signal is to be recorded, a plurality ofelectrostatic recording means adjacent said picture drum, means forprojecting recording fluids of different colors through each of saidrecorders, means controlled by received signal pulses for varying thepotential applied to each of said electrostatic recorders, andcontrolling thereby therecording fluid reaching said record surface.

l2. In an apparatus for recording pictures in colors closelyapproximating those of an originally transmitted picture, means forreceiving signals varied in accordance with the several component toneintensities of elemental areas on a transmitted picture surface, arecording drum carrying a surface upon which the received signal is tobe recorded, a plurality of electrostatic recording means adjacent saidpicture drum, means for projecting recording fluids of different colorsthrough each of said recorders, means controlled by received signalpulses for varying the potentials applied to each of said electrostaticreeorders, means controlled by the rotation of said recording drum forsuccessively and alternately closing the supply of recording fluid tosaid recorders so as to supply fluid to only a single recorder at anypredetermined time interval, and means also controlled by the rotationof said drum for altenately and successively connecting the saidrecorders with said signal receiving means so as to produce a recordedpicture having successive lines thereof recorded in different componentcolors and a finished picture in Which the color blending closelyapproximates that in the said original picture.

13. The method of applying to a surface a plurality of materials ofdifferent primary colors for forming a colored record image on thesurface which comprises projecting recording mediums, each of a selectedprimary color, toward a record surface, controlling each of therecording mediums in a manner such that they operate severally, limitingthe recording action of each medium to predetermined periods, andindependently controlling the amount of each of the recording mediumsreaching the record surface.

ing fluids for forming a colored record image on the surface Whichcomprises projecting 14. The method of producing colored the markingfluids toward the record surface,

duplicates corresponding to originals' transmitted which comprises thesteps of projecting a plurality of recording mediums, each of a separateprimary color, toward a record surface, varying the time of operation ofeach of the recording mediums in a manner such that each medium iscapable of acting separately upon the record surface for predeterminedtime periods, and varying the amount of recording medium reaching therecord surface in accordance with the tone value of the originalcorresponding to the primary color projected 15. A system for producingan image from received signaling .impulses corresponding to thecomponent colors of successive elements which comprises a receivingsurface, means for projecting a plurality of color marking mediumstoward said record, means for controlling the separate marking' mediumsindependently in accordance with the tone of the primary color of theoriginal represented by the separate marking mediums, and means forlimiting the marking action to a single recording medium duringpredetermined time intervals.

16. A system for producing color duplicates corresponding to transmittedrecords which comprises projecting a plurality of colored markingfluids, each of a selected primary color, toward a record surface,producing a relative movement between said marking fluids and saidrecord surface so as to cause said marking fluids to trace said recordsurface in a line for line manner, sequentially changing the recordingaction from one to another of said marking mediums at each change in theline for line manner of tracing, and varying the intensity of marks ofeach of the independent marking fluids in accordance with the tone valueof the selected primary colors.

17. A system for producing color duplicates corresponding to transmittedrecords which comprises projecting a plurality of complementarilycolored marking fluids upon a record surface, rotating the said recordsurface relative to the source of said marking fluids so as to causesaid marking fluids to trace said record surface in a series of adjacentlines, limiting the action of the marking fluids upon the record surfaceto a single color fluid at any instant, sequentially changing therecording action from one to another of said marking mediums at thecompletion of each rotation of the record surface, and varying theintensity of marking of each of the independent marking fluids inaccordance with the tone value of the selected primary colors.

18. The method of applying to a surface a plurality ofcomplementarily-colored markcontrolling each of the recording mediums ina manner such that they operate severally, limiting the recordingactionof each marking fluid to predetermined time periods during thereproduction, and electrostatica-lly controlling the amount of eachseparate marking fluid reaching the record surface during the severaloperations thereof.

19. In an apparatus for recording picturesA in colors closely.approximating those of an original picture, the method which comprisesreceiving signals corresponding to the predetermined component colorscomprising the original picture, projecting toward a recording surfacecolored recording fluids, and sequentially changing the recording actionfrom one to another of the colored recording fluids.

RICHARD HOWLAND RANGER.

SAMUEL B. SMITH.

lOtl

